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which is better adc input single ended or differential

Mark Anthony Cruz
Intellectual 600 points
Other Parts Discussed in Thread: ADS8332

I would like to know what must be used in my study about PZT strain gauge ADC. I tried to find your website for ADC products with 16bit 500KSPS bipolar input -/+10V but all are single ended adc input. Can someone help me for this problem and explain difference in operation between single ended and differential. Thanks

  • 0
    Guru 192875 points
    Hi Mark,

    which is better adc input single ended or differential

    You can go through various links on this topic, one of them being: electronics.stackexchange.com/.../differential-or-single-ended-adc

    Regards,
    Gautam
  • 0 in reply to Gautam Iyer
    TI__Genius 14001 points

    Mark,

     Are you looking for a C2000 microcontroller with embedded ADC or a standalone discrete ADC for this application?  All C2000 embedded ADCs are unipolar and only one C2000 device family (F2837x) supports differential input which also has our only 16b ADC.  Differential inputs are sometimes preferred since it can provide noise cancellation across the differential pair, but obviously comes with the price of less channels and additional board cost if the sampled signal is not natively differential.

     Many times an ADC is selected so its input characteristics match the signal being sampled but certainly circuits can be designed to scale the voltage range to the ADC full scale voltage (including conversion of bipolar to unipolar) as well as converting differential to single ended.

     If you are actually interested in a discrete ADC please be sure to visit the TI data converter site and forums.

    Regards,

    Joe

  • 0 in reply to Joe Prushing
    Intellectual 600 points

    Joe,

    I am planning to use an external adc, i have now ads8332 in which a single ended input range is 0 to 5.5V but my system requirements needed a bipolar input rang -10 to +10 V. Here is the block diagram of my system: and i cant decide which adc is better for this, differential input or single ended.

  • 0 in reply to Mark Anthony Cruz
    TI__Genius 14001 points
    OK, in since you are using the ADS8332 or potentially some other discrete ADC, you'll probably get more practical help from the appropriate analog forum (linked in my previous post). There will be a different group of engineers monitoring that forum who are much more familiar with that line of devices.

    My last two cents on the matter: in the block diagram it gives the impression the gauge output is differential. If this is the case, it may be more straight forward to keep the signal differential and use a differential ADC, if you can find a suitable ADC that is. If the gauge output is single ended, I would expect converting to differential would not be worth the additional cost/effort unless:
    1) you select an ADC for other features (input range, sample rate, accuracy) that happens to be differential or
    2) there is a long trace between the gauge and ADC that could pick up noise.

    Good luck!